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  • Pet Rocks were a 1970s fad conceived in Los Gatos, California by an advertising executive, Gary Dahl. The first Pet Rocks were ordinary gray pebbles bought at a builder's supply store and marketed as if they were live pets. The fad lasted only about six months, ending with the Christmas season in December 1975; but in its short run, the Pet Rock made Dahl a millionaire.

    Gary Dahl...not dumb as a rock.

    January 27, 2008